KR900000409B1 - Constant-frequency generator - Google Patents

Abstract

The generator for generating the power with constant frequency regardless of the speed variation of a motor comprises a rotator (2) including a secondary coil (11) of signal generator (TG), a controller (12) for converting the output signal of the ssecondary coil to the phase signal, a coil (7) for outputting the AC current, and an inverter and a converter (5,8) for modulating the output power, and a secondary coil of an induction generator (IG), and a stator including a primary coil (3) of an induction motor, an exciting coil for generating magnetic field, a primary coil of a signal generator, and a 3-phase oscillator (9) for generating 3-phase signal.

Description

Constant frequency generator

1 is a connection diagram showing an embodiment of a constant frequency generator according to the present invention.

2 is a connection diagram of a conventional winding type induction generator.

* Explanation of symbols for main parts of the drawings

IG: Winding Induction Generator ACE: AC Exciter

TG: Signal generator 1: prime mover

2: rotor 3: primary winding

4: secondary winding 5: inverter

6: DC winding winding 7: AC output winding

8: cone converter 9: three-phase oscillator

10: primary winding for signal 11: secondary winding for signal

12: controller

The present invention relates to a constant frequency generator capable of generating electric power of a constant frequency despite being driven by a prime mover whose rotational speed varies.

For example, in a marine power generation apparatus, a generator can be driven by receiving power from a driving engine of a ship without installing diesel engines for power generation, thereby generating low-efficiency, low-efficiency electric power with high efficiency. .

However, such a power generator has a problem that the rotational speed of the main engine always fluctuates, and thus the output power frequency of the generator also fluctuates.

Therefore, in order to avoid fluctuations in the output current of the generator, as shown in FIG. 2, the generator is a winding type induction generator IG instead of a synchronous generator, and is connected to the secondary winding 20 of the winding induction generator IG. It is proposed to obtain low-frequency three-phase alternating current through the slip ring (21) and to excite the secondary winding (20) from the primary winding (22) of the wound induction generator (IG) to obtain an AC power of a desired frequency. It became.

At this time, in the power generator of FIG. 2, the frequency of the rotor is f [Hz], the rotation speed is N [rPM], and the number of electrodes is P.

Become.

Therefore, for the sake of simplicity of the following description, the rotational speed is assumed to be expressed by fr, the frequency converted from N by the above formula (1).

In FIG. 2, between the primary frequency f1 and the secondary frequency f2 of the wound induction generator IG,

There is a relationship.

If, in the winding type induction generator IG of FIG. 2, the frequency fr of the rotor rotates at a speed equivalent to 50 [Hz], fr = 50 [Hz], and the secondary frequency f2 is 10 [Hz]. ] To excite the secondary winding 20 at f2 = 10 [Hz], the primary frequency f1 of the primary winding 22 is the frequency fr of the rotor is the secondary frequency f2. The sum of f1 = fr + f2 = 50Hz = 60z is induced.

Using the above principle, even if the frequency fr of the rotor changes, the secondary frequency f2 can be controlled to generate the primary frequency f1, so that the constant frequency is always constant despite the variation of the rotational speed of the rotor. It is possible to configure a generator that generates a voltage of frequency.

At this time, the power P2 supplied from the secondary winding 20 is driven by the power P1 of the primary winding 22.

to be.

Thus, for example, if the frequency fr of the rotor is 20% lower than the frequency f1, the secondary frequency must replenish 20% of the power.

However, this approach has the following significant drawbacks.

(1) It is necessary to install a slip ring for exciting the secondary winding in order to excite the secondary winding with 20% power supplement, and maintenance of the slip ring is necessary for continuous use.

(2) As a secondary excitation power supply, it is necessary to use a self-inverting inverter of a variable frequency, a cyclo converter, or the like, whose control is complicated and the control apparatus is expensive.

(3) In order to generate voltage in a place where there is no initial power supply, a large DC initial excitation power supply is required.

(4) In order to perform 20% secondary excitation, the primary winding must generate 120% of capacity considering its quantity, so that the generator of large size must be used.

Accordingly, it is an object of the present invention to provide a constant frequency generator capable of simplifying the control system by brushlessing and performing initial voltage establishment with less power.

The constant frequency generator of the present invention includes a prime mover, a winding induction generator driven as the prime mover, an alternating current excitation unit for supplying excitation power to the winding induction generator, and rectifying the output power of the alternating current excitation unit into an alternating current. Conveyor and inverter for supplying the winding type induction generator and the signal generator for receiving a signal from the three-phase oscillator and transmitting the signal to the control device of the inverter, the primary winding of the winding induction generator And the DC field winding of the AC exciter, the three-phase oscillator of the signal generator, and the primary winding for the signal are installed on the stator side of the generator, and connected to the secondary winding of the wound induction generator and the AC output winding of the AC exciter. The signal secondary winding and the control device of the bearer and the inverter and the signal generator are characterized in that they are installed on the rotor side.

Referring to the present invention in detail by the embodiment shown in Figure 1 as follows.

The constant frequency generator according to the present invention is roughly divided into a prime mover (1), a wound induction generator (IG) driven as the prime mover (1), and an AC exciter for supplying an excitation current to the wound induction generator (IG). (ACE), the converter (8) which rectifies the AC output of the AC output winding (7) of the AC excitation device (ACE), and converts this into AC to supply the excitation power to the winding induction generator (IG) as excitation power. It is comprised as the signal generator TG which receives the signal from the inverter 5 and the three-phase oscillator 9, and transmits a signal to the control apparatus 12 of the said inverter 5.

In the present invention, the primary winding 3 of the winding type induction generator IG, the DC field winding 6 of the AC exciter ACE, and the three-phase resonator 9 of the signal generator TG; The primary winding 10 for the signal is installed on the stator side, and the secondary winding 4 of the wound induction generator IG and the AC output winding 7 and the converter 8 of the AC exciter ACE and The inverter 2 and the signal secondary winding 11 of the signal generator TG are installed on the rotor 2 side, and the rotor 2 is directly connected to the prime mover 1. Combined and driven.

Next, the operation of the constant frequency generator of the present invention configured as described above will be described.

The rotor 2 is rotated at the rotational frequency fr by the rotational speed N by the drive of the prime mover 1, and the DC field winding of the AC exciter ACE is rotated by the rotation of the rotor 2. 6) The excitation causes AC power according to the rotation speed of the prime mover 1 to be induced in the AC output winding 7 of the AC exciter ACE.

In addition, a signal of frequency f is generated in the three-phase oscillator 9 of the signal generator TG and applied to the signal primary winding 10, and the rotating magnetic field generated by the signal primary winding 10 is used for signal two. The voltage of the frequency f-fr is generated in the signal secondary winding 11 that is rotated at the rotational frequency fr by the driving of the prime mover 1 by being driven by the primary winding 11, so that the control device 12 Is entered.

At this time, the rotating magnetic field generated by the signal primary winding 10 is used only for the signal, and may be extremely small, such as the three-phase oscillator 9 and the signal primary winding 10.

In this state, the AC power induced in the AC output winding 7 of the AC exciter ACE is converted into DC in the converter 8 and reconverted into AC power in the inverter 5, and then again. The converted AC power excites the secondary winding 4 of the wound induction generator IG. At this time, the AC power reconverted by the inverter 5 is inputted with a voltage of frequency f-fr. The control signal is received from the control device 12, and in synchronization with this, the elements of the inverter 5 are sequentially turned on to be converted into three-phase AC power of frequency f-fr.

Since the secondary winding 4 of the wound induction generator IG is excited by the AC power of the frequency f-fr converted in this way, the frequency f from the primary winding 3 of the wound induction generator IG. -fr + fr) power is output.

Therefore, since the signal is oscillated at the frequency f in the three-phase oscillator 9 of the signal oscillator TG, the power frequency f1 output from the primary winding 3 of the wound induction generator IG is rotated once. Irrespective of the change in rotation of the electrons 2, the frequency f oscillated from the three-phase oscillator 9 is perfectly matched.

At this time, the voltage induced in the primary winding 3 is expressed by equation (1).

It becomes

Here, the magnitude | size of the voltage V1 induced in the primary winding 3 of the winding induction generator IG is demonstrated.

The generated voltage of the rotor 2 is the rotational speed X magnetic flux amount.

Therefore, the magnetic flux amount is proportional to the output voltage V2 of the inverter 5

(K is proportional integer).

Therefore, in order to keep the voltage V1 constant,

Since the output voltage V2 of the inverter 5 may be controlled so as to be, it is controlled by the following two methods.

(1) The current of the DC field winding 6 of the AC exciter ACE is controlled.

(2) A separate signal is transmitted to the rotor 2 side, and the conduction angle of the inverter 5 is controlled.

However, the method of keeping the voltage V1 induced in the primary winding 3 of the winding-type induction generator IG constant is extremely easy in the past, and this is not an element of the present invention.

As described above, according to the present invention, the constant frequency generator is formed by using a winding type induction generator driven as a prime mover, and combining the generator with an alternating current exciter, a cone inverter, an inverter, and a signal generator.

(1) Since the slip ring is unnecessary, it becomes a complete brushless.

(2) The inverter 5 on the rotor 2 may be relatively simple, and the control is simple.

(3) Establishing the first voltage is sufficient only by supplying the current applied to the DC field winding 6 and the required electric power of the three-phase oscillator 9, and a small electric power may be sufficient.

(4) Since secondary power is supplied by the ac exciter (ACE) from the side, it is not necessary to consider its quantity in the capacity of the primary side.

Is to have such advantages.

Claims (1)

The primary winding 11 for the signal generator TG and the secondary winding 11 for the signal on the axis of the prime mover 1 having a rotating speed, the rotor 2 driven as the prime mover 1. The control device 12 for converting the output signal of the signal into a phase signal, the AC exciter (ACE) is the AC output winding 7 and the inverter 5 for converting the output power of the AC output winding (7) And a secondary winding 4 of the induction generator IG, which is excited with the output power of the cone inverter 8 and the electric inverter 5 and the cone inverter 8, on the stator side, Primary winding (3) of winding type induction generator (IG), DC field winding (6) of AC exciter (ACE), primary winding (10) for signal of signal generator (TG), primary for electric signal A constant frequency generator, characterized in that the winding 10 is formed of a three-phase oscillator (9) for generating a three-phase signal according to the power frequency output from the primary winding (3) of the electric winding type induction generator (IG).

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